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EP0207914B1 - Cutting insert - Google Patents

Cutting insert Download PDF

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Publication number
EP0207914B1
EP0207914B1 EP86850217A EP86850217A EP0207914B1 EP 0207914 B1 EP0207914 B1 EP 0207914B1 EP 86850217 A EP86850217 A EP 86850217A EP 86850217 A EP86850217 A EP 86850217A EP 0207914 B1 EP0207914 B1 EP 0207914B1
Authority
EP
European Patent Office
Prior art keywords
cutting edge
cutting
edge
chamfers
curved
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP86850217A
Other languages
German (de)
French (fr)
Other versions
EP0207914A1 (en
Inventor
Lars Markusson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Santrade Ltd
Original Assignee
Santrade Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Santrade Ltd filed Critical Santrade Ltd
Publication of EP0207914A1 publication Critical patent/EP0207914A1/en
Application granted granted Critical
Publication of EP0207914B1 publication Critical patent/EP0207914B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/16—Milling-cutters characterised by physical features other than shape
    • B23C5/20—Milling-cutters characterised by physical features other than shape with removable cutter bits or teeth or cutting inserts
    • B23C5/202—Plate-like cutting inserts with special form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/20—Top or side views of the cutting edge
    • B23C2200/201—Details of the nose radius and immediately surrounding areas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/20—Top or side views of the cutting edge
    • B23C2200/205—Discontinuous cutting edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/28—Angles
    • B23C2200/281—Negative rake angles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/28—Angles
    • B23C2200/283—Negative cutting angles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/32—Chip breaking or chip evacuation
    • B23C2200/326—Chip breaking or chip evacuation by chip-breaking grooves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/23—Cutters, for shaping including tool having plural alternatively usable cutting edges
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/23—Cutters, for shaping including tool having plural alternatively usable cutting edges
    • Y10T407/235—Cutters, for shaping including tool having plural alternatively usable cutting edges with integral chip breaker, guide or deflector

Definitions

  • the present invention relates to a cutting insert through which shape the above-mentioned drawback is avoided.
  • a favourable upset of the chip is achieved at the cutting edges of the corner portion and reduced forces are achieved at the corner between the corner chamfer and the main cutting edge during the machining.
  • Fig. 1 shows a corner portion of a conventional insert for flat face milling.
  • a corner chamfer 21 has been formed at the corner portion, between a minor cutting edge 22 and an associated main cutting edge 23.
  • the main cutting angle K 2 between the edge 24 of the corner chamfer 21 and the minor cutting edge is approximately half as large as the cutting angle K 1 between the minor cutting edge and the main cutting edge.
  • This geometry gives a relatively sharp corner 25 between the corner chamfer and the main cutting edge.
  • the chip is forced perpendicularly away from each active cutting edge, see arrows, and therefore the part of the chip which is generated by the main cutting edge 23 meets the part of the chip which is generated by the corner chamfer 21.
  • the sharp corner 25 between the corner chamfer and main cutting edge is thereby exposed to an increased load relative to the corner chamfer and the main cutting edge and thus becomes the part of the insert which firstly breaks or is deformed.
  • Figs. 2 to 5 show an embodiment of an indexable cutting insert according to the invention.
  • the indexable cutting insert 10 has a square basic shape and comprises a mainly planar upper face 11, a mainly planar lower face 12 and edge surfaces 13, 14, 15, 16 connecting them.
  • the indexable cutting insert has a positive geometry, i e each edge surface forms an acute angle with the upper face 11.
  • the insert may be formed negative, i e the edge surfaces connect the upper and lower faces perpendicularly.
  • the lines of intersection between the planar parts of the edge surfaces 13 to 16 and the upper face 11 form main cutting edges 40.
  • the corner portions on the insert are identically shaped and therefore only one corner is described hereinafter.
  • a plurality of chamfers are formed in the corner portion which is surrounded by the edge surfaces 13 and 14.
  • the edge surface 13 is broken inwardly towards the insert by a first planar chamfer 41 whose line of intersection with the upper face 11 forms a minor cutting edge 42, provided to generate the work piece surface.
  • the minor cutting edge 42 is at least three times the length of the main cutting edge 40.
  • the first chamfer 41 is broken at its other end by a second chamfer 43 defined by K 2 whose line of intersection with the upper face form a cutting edge 45.
  • the internal angle between these chamfers is chosen within the interval 130 to 170 ° .
  • the second chamfer 43 is smoothly broken by a third chamfer 46, defined by K s whose line of intersection with the upper side forms the cutting edge 47.
  • Each cutting edge 45, 47 has a theoretical length L, see Fig. 5, which is defined by the distance between two adjacent break points.
  • the straight cutting edges 45, 47 form an obtuse internal angle of about 140° to 175 ° .
  • the third chamfer 46 smoothly transites into the edge surface 14.
  • Each smooth transition between two straight portions has the shape of a segment of a circle and thus has a constant radius R of curvature, which is at least half of and maximum six times the theoretical length L of the cutting edge 45 or 47.
  • the segment of the circle touches the straight portions for example the edge 47 and the edge 45 at a distance L 1 from the theoretical break point between two straight, adjacent portions arid at opposite sides of the break point.
  • the third chamfer 46 and the edge surface 14 form an obtuse internal angle of 140 to 175 ° .
  • the major part of the minor cutting edge 42 is placed at one side of a bisector B of the cutting corner.
  • the major part of the cutting edges 45,47 of the second chamfers 43, 46 are placed at the opposite side of said bisector
  • the main cutting edge 40 extends from the curved connection with the third chamfer to the minor cutting edge of the adjacent cutting corner.
  • the length of the minor cutting edge 42 is approximately equal to the total length of the transition edges between the minor and main cutting edges.
  • the conventional insert of Fig. 1 was compared with the insert of Fig. 2 according to the invention in a face milling wear test in accordance with A.J. Pekelharing in Annals of the CIRP Vol. 33/1/1984 pages 47 and 48 (Fig. al).
  • the conditions of the two kinds of inserts were identical during the test.
  • the milled length was maximum 600 mm and one insert was used during each test.
  • This configuration of the corner portion results in that the chip which is generated by the cutting edges of the corner portion and which has a direction of flow perpendicular to respective cutting edge in the corner portion is less compressed than that of the insert according to Fig. 1.
  • the insert according to the present configuration present a more even load on the cutting edges and discloses a better toughness during the machining.
  • the straight portions 47, 45 may be connected by a straight edge 48 according to Fig. 6 which breaks respective cutting edge 47, 45 at a distance Li from the theoretical break point of the cutting edges.
  • the distance L 1 is approximately a fourth of the theoretical length L of the cutting edge.
  • Figs. 7 to 9 show another embodiment of an indexable cutting insert according to the invention.
  • the indexable cutting insert 10' has a square basic shape and comprises a mainly planar upper face 11', a mainly planar lower face 12' and edge surface 13',14',15',16' connecting them.
  • upper face is meant the plane which is formed by the points or areas at the periphery of the insert which are arranged furthest away from the opposite face.
  • the indexable cutting insert has a positive geometry, i e each edge surface forms an acute internal angle with the plane P of the upper face.
  • the insert may also be shaped negative, i e the edge surfaces connect the upper and lower faces perpendicularly.
  • a concave recess 17 is formed around the mid portion 11" of the upper face.
  • the concave recess 17 extends from the mid portion 11" to a curved circumferential portion 18 between two adjacent corner portions.
  • the center of the portion 18 is arranged at a distance h from the plane P of the upper face. The distance h varies depending on where the cross-section is taken.
  • the curved portion 18 which has a width Wi is bordered outwardly by an other curved portion 19 which constitutes a strengthening bevel for the cutting edges defined by the lines of intersection between the strengthening bevel and the edge surfaces 13' - 16'.
  • the strengtening bevel 19 extends along all cutting edges except along the minor cutting edges, which are formed at the line of intersection between the portions 18 and the first chamfers.
  • the strengthening bevel has the width W 2 which with the curved portion 18 forms a total width W parallel with the plane P.
  • the curved inner portion 18, see Fig. 10 may extend outwardly to the edge surface 14' and then it has a width W 3 a little more than W.
  • the width W 3 is larger than the recommended tooth feed for the insert preferably twice as large. With this geometry even lower cutting forces are achieved during the milling operation compared with the insert in Figs. 2-6.
  • the part of the recess 17 climbing towards the mid portion 11" of the upper face 11' is arranged to bend away the cut chip such that this will not hit against the milling cutter body. Said part mainly has no chip breaking function
  • the part of the groove 17 climbing towards the portion 18 forms an angle a, between 5 ° - 30 ° with the portion.
  • Each main cutting edge 40' is curved such that its center is arranged closer to the lower face of the insert than the ends of the edge. This shape of the edge 40' means a built-in, large inclination angle in the insert and therefore the axial cutting forces are reduced during the milling operation.
  • the chamfers at the corner portions are identical with the ones shown in Figs. 2 to 6.
  • Figs. 11, 12 and 13, 14 show two triangular versions of the indexable cutting inserts shown in Fig. 2 - 5, resp Figs. 7 to 10.
  • the difference from the inserts shown in these figures lies only in that the main cutting edges of the triangular inserts meet in respective corner portion under a more acute internal angle, such that each minor cutting edge becomes mainly perpendicular to the associated main cutting edge.
  • the corner portions may be formed in accordance with Fig. 6.
  • the insert according to Figs. 13 and 14 has a cross section in accordance with Fig. 9 but may alternatively have a cross section according to Fig. 10.
  • the invention relates to an indexable cutting insert through which shape a strong insert is achived. Furthermore the point load on the insert corner is reduced and the cutting force during the machining are reduced.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
  • Measuring Or Testing Involving Enzymes Or Micro-Organisms (AREA)

Description

  • It is previously known through GB-A 951 624 to provide the corner portions of the insert with a corner chamfer between associated minor and main cutting edges, the external angle between said minor cutting edge and said corner chamfer being approximately half as large as the external angle between the minor edge and the main cutting edge. This geometry gives a relatively sharp corner between the corner chamfer and the main cutting edge. During milling operations the chip is forced perpendicularly to each active cutting edge and therefore the part of the chip generated by the main cutting edge collides with the part of the chip generated by the corner chamfer. The sharp corner between the corner chamfer and the main cutting edge is thus exposed to an increased load relative to the corner chamfer and the main cutting edge and thus becomes the part of the insert which firstly is cracked or deformed. It is also known to provide the transition between the minor cutting edge and the main cutting edge with a rounded-off portion, having a constant radius. Since the generated chip is guided perpendicularly to the edge of the portion and the main cutting edge also in this case a concentrated compression of the chip arises at the active cutting corner.
  • The present invention relates to a cutting insert through which shape the above-mentioned drawback is avoided. A favourable upset of the chip is achieved at the cutting edges of the corner portion and reduced forces are achieved at the corner between the corner chamfer and the main cutting edge during the machining.
  • The invention will be more closely described hereinafter with reference to the appended drawings wherein further characterizing features and advantages will become apparent.
    • Fig. 1 shows a corner portion of a conventional cutting insert, in plan view.
    • Fig. 2 shows an embodiment of an indexable cutting insert according to the invention in plan view.
    • Fig. 3 shows the indexable cutting insert in a side view.
    • Fig. 4 shows a corner portion of the indexable cutting insert, in magnification.
    • Fig. 5 shows a corner portion of the indexable cutting insert, in magnification.
    • Fig. 6 shows an alternative embodiment of the corner portion of an insert in a plan view.
    • Fig. 7 shows an alternative embodiment of an indexable cutting insert according to the invention in a plan view.
    • Fig. 8 shows a side view of the insert in Fig. 7.
    • Fig. 9 shows a cross-section of the insert according to the line IX-IX in Fig.7.
    • Fig. 10 shows a cross-section of a further embodiment of an indexable cutting insert according to the invention.
    • Figs. 11 and 12 show a further embodiment of an indexable cutting insert according to the invention in a plan view and a side view, respectively.
    • Figs. 13 and 14 show still a further embodiment of an indexable cutting insert according to the invention in a plan view and a side view, respectively.
  • Fig. 1 shows a corner portion of a conventional insert for flat face milling. A corner chamfer 21 has been formed at the corner portion, between a minor cutting edge 22 and an associated main cutting edge 23. The main cutting angle K2 between the edge 24 of the corner chamfer 21 and the minor cutting edge is approximately half as large as the cutting angle K1 between the minor cutting edge and the main cutting edge. This geometry gives a relatively sharp corner 25 between the corner chamfer and the main cutting edge. During the milling operation the chip is forced perpendicularly away from each active cutting edge, see arrows, and therefore the part of the chip which is generated by the main cutting edge 23 meets the part of the chip which is generated by the corner chamfer 21. The sharp corner 25 between the corner chamfer and main cutting edge is thereby exposed to an increased load relative to the corner chamfer and the main cutting edge and thus becomes the part of the insert which firstly breaks or is deformed.
  • Figs. 2 to 5 show an embodiment of an indexable cutting insert according to the invention. The indexable cutting insert 10 has a square basic shape and comprises a mainly planar upper face 11, a mainly planar lower face 12 and edge surfaces 13, 14, 15, 16 connecting them. The indexable cutting insert has a positive geometry, i e each edge surface forms an acute angle with the upper face 11. The insert may be formed negative, i e the edge surfaces connect the upper and lower faces perpendicularly. The lines of intersection between the planar parts of the edge surfaces 13 to 16 and the upper face 11 form main cutting edges 40.
  • The corner portions on the insert are identically shaped and therefore only one corner is described hereinafter. A plurality of chamfers are formed in the corner portion which is surrounded by the edge surfaces 13 and 14. The edge surface 13 is broken inwardly towards the insert by a first planar chamfer 41 whose line of intersection with the upper face 11 forms a minor cutting edge 42, provided to generate the work piece surface. The minor cutting edge 42 is at least three times the length of the main cutting edge 40.The first chamfer 41 is broken at its other end by a second chamfer 43 defined by K2 whose line of intersection with the upper face form a cutting edge 45. The internal angle between these chamfers is chosen within the interval 130 to 170°.
  • The second chamfer 43 is smoothly broken by a third chamfer 46, defined by Ks whose line of intersection with the upper side forms the cutting edge 47. Each cutting edge 45, 47 has a theoretical length L, see Fig. 5, which is defined by the distance between two adjacent break points. The straight cutting edges 45, 47 form an obtuse internal angle of about 140° to 175°. The third chamfer 46 smoothly transites into the edge surface 14. Each smooth transition between two straight portions has the shape of a segment of a circle and thus has a constant radius R of curvature, which is at least half of and maximum six times the theoretical length L of the cutting edge 45 or 47. The segment of the circle touches the straight portions for example the edge 47 and the edge 45 at a distance L1 from the theoretical break point between two straight, adjacent portions arid at opposite sides of the break point. The third chamfer 46 and the edge surface 14 form an obtuse internal angle of 140 to 175°. The major part of the minor cutting edge 42 is placed at one side of a bisector B of the cutting corner. The major part of the cutting edges 45,47 of the second chamfers 43, 46 are placed at the opposite side of said bisector The main cutting edge 40 extends from the curved connection with the third chamfer to the minor cutting edge of the adjacent cutting corner. The length of the minor cutting edge 42 is approximately equal to the total length of the transition edges between the minor and main cutting edges.
  • The conventional insert of Fig. 1 was compared with the insert of Fig. 2 according to the invention in a face milling wear test in accordance with A.J. Pekelharing in Annals of the CIRP Vol. 33/1/1984 pages 47 and 48 (Fig. al). The conditions of the two kinds of inserts were identical during the test. The milled length was maximum 600 mm and one insert was used during each test.
  • Four of fourteen tested conventional inserts were damaged at the cutting corner while none of the fourteen inserts according to the present invention was damaged during the test.
  • This configuration of the corner portion results in that the chip which is generated by the cutting edges of the corner portion and which has a direction of flow perpendicular to respective cutting edge in the corner portion is less compressed than that of the insert according to Fig. 1. The insert according to the present configuration present a more even load on the cutting edges and discloses a better toughness during the machining.
  • Alternatively the straight portions 47, 45 may be connected by a straight edge 48 according to Fig. 6 which breaks respective cutting edge 47, 45 at a distance Li from the theoretical break point of the cutting edges. The distance L1 is approximately a fourth of the theoretical length L of the cutting edge.
  • Figs. 7 to 9 show another embodiment of an indexable cutting insert according to the invention. The indexable cutting insert 10' has a square basic shape and comprises a mainly planar upper face 11', a mainly planar lower face 12' and edge surface 13',14',15',16' connecting them. By the word "upper face" is meant the plane which is formed by the points or areas at the periphery of the insert which are arranged furthest away from the opposite face. The indexable cutting insert has a positive geometry, i e each edge surface forms an acute internal angle with the plane P of the upper face. The insert may also be shaped negative, i e the edge surfaces connect the upper and lower faces perpendicularly. A concave recess 17 is formed around the mid portion 11" of the upper face. The concave recess 17 extends from the mid portion 11" to a curved circumferential portion 18 between two adjacent corner portions. The center of the portion 18 is arranged at a distance h from the plane P of the upper face. The distance h varies depending on where the cross-section is taken. The curved portion 18 which has a width Wi is bordered outwardly by an other curved portion 19 which constitutes a strengthening bevel for the cutting edges defined by the lines of intersection between the strengthening bevel and the edge surfaces 13' - 16'. The strengtening bevel 19 extends along all cutting edges except along the minor cutting edges, which are formed at the line of intersection between the portions 18 and the first chamfers. The strengthening bevel has the width W2 which with the curved portion 18 forms a total width W parallel with the plane P. Alternatively the curved inner portion 18, see Fig. 10, may extend outwardly to the edge surface 14' and then it has a width W3 a little more than W. The width W3 is larger than the recommended tooth feed for the insert preferably twice as large. With this geometry even lower cutting forces are achieved during the milling operation compared with the insert in Figs. 2-6. The part of the recess 17 climbing towards the mid portion 11" of the upper face 11' is arranged to bend away the cut chip such that this will not hit against the milling cutter body. Said part mainly has no chip breaking function The part of the groove 17 climbing towards the portion 18 forms an angle a, between 5° - 30° with the portion.
  • The lines of intersection between the planar portions of the edge surfaces 13' - 16' and the portion 18 or 19 form main cutting edges 40'. Each main cutting edge 40' is curved such that its center is arranged closer to the lower face of the insert than the ends of the edge. This shape of the edge 40' means a built-in, large inclination angle in the insert and therefore the axial cutting forces are reduced during the milling operation.
  • The chamfers at the corner portions are identical with the ones shown in Figs. 2 to 6.
  • Figs. 11, 12 and 13, 14 show two triangular versions of the indexable cutting inserts shown in Fig. 2 - 5, resp Figs. 7 to 10. The difference from the inserts shown in these figures lies only in that the main cutting edges of the triangular inserts meet in respective corner portion under a more acute internal angle, such that each minor cutting edge becomes mainly perpendicular to the associated main cutting edge. Alternatively the corner portions may be formed in accordance with Fig. 6. The insert according to Figs. 13 and 14 has a cross section in accordance with Fig. 9 but may alternatively have a cross section according to Fig. 10.
  • Thus the invention relates to an indexable cutting insert through which shape a strong insert is achived. Furthermore the point load on the insert corner is reduced and the cutting force during the machining are reduced.

Claims (9)

1. A cutting insert for chip forming machining having a polygonal basic shape, comprising two mainly parallel faces (11, 12; 11 12') and edge surfaces (13-16; 13'-16') joining them, lines of intersection between two of said edge surfaces and at least one of said faces (11, 11') forming main cutting edges (40; 40'), and a plurality of first and second chamfers (41, 43, 46, 48) being formed at the transition between two of said edge surfaces (13, 14; 13', 14') in a corner portion of the insert, the first (41) of said chamfers forming a minor cutting edge (42) at its line of intersection with said face (11; 11'), said corner portion having a bisector B, the transition between the minor cutting edge (42) and the associated main cutting edge (40; 40') in the corner portion of the insert comprising at least two straight cutting edges (45, 47) which form an obtuse internal angle with each other, said main cutting edge being essentially longer than the associated minor cutting edge, the major part of said minor cutting edge being placed at one side of said bisector (B) and the major part of the cutting edges of the second chamfers (43, 46, 48) along intersection lines with said face (11; 11') being arranged at the opposite side of said bisector, the main cutting edge (40; 40') generally extending from a cutting edge of a second chamfer to a minor cutting edge at an adjacent corner portion, whereby at least two and maximum four second chamfers (43, 46, 48) are formed between the first chamfer (41) and the associated edge surface (14; 14').
2. Cutting insert according to claim 1, whereby the transition between the minor cutting edge (42) and the associated main cutting edge (40) in the corner portion of the insert comprises alternating straight and curved cutting edges.
3. Cutting insert according to claim 1, whereby the second chamfers (43,46) , form mainly straight cutting edges (45,47) at the lines of intersection with the face (11 ;11'), whose extension lines form discretely, increasing, acute angles with the minor cutting edge or its extension line, a transition between two adjacent cutting edges of said second chamfers (43,46) forming a convexly curved cutting edge and the transition between the cutting edge of a second (46) of said chamfers and an associated main cutting edge (40E') forming a convexly curved cutting edge.
4. Cutting insert according to claim 3, whereby the cutting edge (45,47) of each second chamfer (43,46) has a theoretical length L and in that each convex cutting edge is curved such that it touches the cutting edge of the adjacent second chamfer (43,46) at a distance L! from the theoretical intersection point between two second chamfers which is approximately a fourth of the theoretical length L.
5. Cutting insert according to claim 3, whereby the radius (R) of curvature of each curved cutting edge is at feast half and maximum six times the theoretical length of the cutting edge (45,47).
6. Cutting insert according to claim 1, whereby at least two and maximum four second chamfers (43,46) are formed between the first chamfer (41) and the associated edge surface (14; 14'), forming mainly straight cutting edges at the lines of intersection with the side (11 ;11'), whose extension lines form discretely increasing acute angles with the associated minor cutting edges (42) or its extension line, a transition between two adjacent cutting edges of said second chamfers (43,46) forming a straight cutting edge (48).
7.Cutting insert according to claim 1, whereby the main cutting edge (40; 40') in side projection is arch- shaped, the center of said main cutting edge having a less distance to the opposite face (12; 12') than the distance from the end portions of the main cutting edge to said face.
8. Cutting insert according to claim 7, whereby a concave recess (17) is formed inside the main cutting edge (40'), which extends from the mid portion (11 ") of the upper face (11') towards a curved, circumferential first bevel portion (18) directly or indirectly connected to the edge surfaces (13'-16'), the center of said first bevel (18) being curved equal to the associated main cutting edge (40').
9. Cutting insert according to claim 8, whereby an outer curved second bevel (19) is arranged between the first bevel (18) and the associated edge surface (13'-16'), said second bevel being curved equal to the first bevel.
EP86850217A 1985-07-03 1986-06-17 Cutting insert Expired EP0207914B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8503304 1985-07-03
SE8503304A SE448431B (en) 1985-07-03 1985-07-03 REQUEST FOR TEAM DISPOSAL PROCESSING

Publications (2)

Publication Number Publication Date
EP0207914A1 EP0207914A1 (en) 1987-01-07
EP0207914B1 true EP0207914B1 (en) 1989-05-24

Family

ID=20360793

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86850217A Expired EP0207914B1 (en) 1985-07-03 1986-06-17 Cutting insert

Country Status (6)

Country Link
US (1) US4681488A (en)
EP (1) EP0207914B1 (en)
JP (1) JPH0790412B2 (en)
BR (1) BR8603047A (en)
DE (1) DE3663466D1 (en)
SE (1) SE448431B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6227772B1 (en) 1997-02-10 2001-05-08 Widia Gmbh Cutting insert and milling tool

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Also Published As

Publication number Publication date
SE448431B (en) 1987-02-23
BR8603047A (en) 1987-02-17
JPS629812A (en) 1987-01-17
EP0207914A1 (en) 1987-01-07
SE8503304L (en) 1987-01-04
SE8503304D0 (en) 1985-07-03
JPH0790412B2 (en) 1995-10-04
DE3663466D1 (en) 1989-06-29
US4681488A (en) 1987-07-21

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